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Uncertainties of the b -> d transition form factor from the d-meson leading-twist distribution amplitude

文献类型：期刊论文

作者Zhang, Yi1; Zhong, Tao1; Wu, Xing-Gang2; Li, Ke1; Fu, Hai-Bing3; Huang, Tao4
刊名European physical journal c
出版日期2018-01-25
卷号78期号:1页码:12
ISSN号1434-6044
DOI10.1140/epjc/s10052-018-5551-4
通讯作者Zhong, tao(zhongtao@htu.edu.cn)
英文摘要The b -> d transition form factor (tff) f(+)(b -> d)(q(2)) is determined mainly by the d-meson leadingtwist distribution amplitude (da), phi(2; d), if the proper chiral current correlation function is adopted within the light-cone qcd sum rules. it is therefore significant to make a comprehensive study of da phi(2; d) and its impact on f(+)(b -> d)(q(2)). in this paper, we calculate the moments of phi(2; d) with the qcd sum rules under the framework of the background field theory. new sum rules for the leading-twist da moments (d) up to fourth order and up to dimension-six condensates are presented. at the scale mu = 2 gev, the values of the first four moments are: (d) = -0.418(-0.022)(+0.021), (d) = 0.289(-0.022)(+0.023), (d) = -0.178 +/- 0.010 and (d) = 0.142(-0.012)(+0.013). basing on the values of (d) (n = 1, 2, 3, 4), a bettermodel of phi(2; d) is constructed. applying this model for the tff f(+)(b -> d)(q(2)) under the light cone sum rules, we obtain f(+)(b -> d)(0) = 0.673(-0.041)(+0.038) and f(+)(b -> d)(q (2)(max)) = 1.117(-0.054)(+0.051). the uncertainty off(+)(b -> d)(q(2)) from phi(2; d) is estimated and we find its impact should be taken into account, especially in low and central energy region. the branching ratio b(b -> dl (v) over bar (l)) is calculated, which is consistent with experimental data.
WOS关键词RELATIVISTIC WAVE-EQUATIONS ; CONE SUM-RULES ; SEMILEPTONIC DECAYS ; BACKGROUND FIELDS ; LATTICE QCD ; MASS
WOS研究方向Physics
WOS类目Physics, Particles & Fields
语种英语
WOS记录号WOS:000423799800001
出版者SPRINGER
URI标识http://www.irgrid.ac.cn/handle/1471x/2177920
专题高能物理研究所
通讯作者Zhong, Tao
作者单位1.Henan Normal Univ, Coll Phys & Mat Sci, Xinxiang 453007, Peoples R China
2.Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China
3.Guizhou Minzu Univ, Sch Sci, Guiyang 550025, Guizhou, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys & Theoret Phys, Ctr Sci Facil, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Yi,Zhong, Tao,Wu, Xing-Gang,et al. Uncertainties of the b -> d transition form factor from the d-meson leading-twist distribution amplitude[J]. European physical journal c,2018,78(1):12.
APA Zhang, Yi,Zhong, Tao,Wu, Xing-Gang,Li, Ke,Fu, Hai-Bing,&Huang, Tao.(2018).Uncertainties of the b -> d transition form factor from the d-meson leading-twist distribution amplitude.European physical journal c,78(1),12.
MLA Zhang, Yi,et al."Uncertainties of the b -> d transition form factor from the d-meson leading-twist distribution amplitude".European physical journal c 78.1(2018):12.

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